Well I am writing on inorganic chemistry first, because most students think that "Ahhh, JEE tests only concepts and logic, there will be hardly any question from inorganic part" . Moreover, some think that "inorganic is wrote learning. I will do it in the end". But the truth is that besides testing your thinking ability, JEE also tests your memorizing capacity through the memory based questions asked under inorganic chemistry and some part of organic chemistry(Practical organic chemistry).
I can give you numerous examples of students who didn't give importance to inorganic chemistry, and got a rank which was higher(higher means higher in magnitude) than what they deserved. One such example is my friend, Aniket Gupta (AIR-641, IIT-JEE 2013) who neglected chemistry(mostly inorganic chemistry). He was superb at Maths and Physics and he could have easily got a rank under 500 had he studied inorganic chemistry seriously.
I can give you numerous examples of students who didn't give importance to inorganic chemistry, and got a rank which was higher(higher means higher in magnitude) than what they deserved. One such example is my friend, Aniket Gupta (AIR-641, IIT-JEE 2013) who neglected chemistry(mostly inorganic chemistry). He was superb at Maths and Physics and he could have easily got a rank under 500 had he studied inorganic chemistry seriously.
For inorganic chemistry, keep the following 3 points in mind:
1.) NCERT is the GodBook. Learn "each and every" word of NCERT for inorganic chemistry. In past few years, IIT's have picked up questions directly from NCERT. Once, an 8 marks matrix match was also picked up directly from NCERT.
2.) Don't leave the inorganic chemistry for the last 2 months. Start preparing for it from the first day itself and seriously "learn" inorganic chemistry for 2 whole years.
3.) Do regular revision. I can bet you that if you don't revise it for about 15 days, then you are sure to forget a large part of it.
Besides NCERT, if you have some time left in your hand, then you can (infact you must) go for JD Lee. It's one of the best books for inorganic chemistry and helps you do develop concepts of inorganic chemistry.
WARNING: Refer to IIT-JEE syllabus if you are deciding to pick up JD Lee. It contains a lot of stuff that is of no use for IIT-JEE.
Download NCERT from HERE
Download NCERT from HERE